Innocence and Experience in the Immune Systemby Ellen Rothenberg
Understanding how and why certain cells in the immune system become "educated" may
eventually give biologists clues to what causes them to go awry and create immune deficiency
and autoimmune conditions.

Dams and Earthquake Safetyby John F. Hall
Civil engineers are trying to develop mathematical models to explain the behavior of dams
under the stress of earthquake shaking  a complex problem with high stakes in a correct
solution.